EP1870923B1 - Magnetron - Google Patents

Magnetron Download PDF

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Publication number
EP1870923B1
EP1870923B1 EP07290752A EP07290752A EP1870923B1 EP 1870923 B1 EP1870923 B1 EP 1870923B1 EP 07290752 A EP07290752 A EP 07290752A EP 07290752 A EP07290752 A EP 07290752A EP 1870923 B1 EP1870923 B1 EP 1870923B1
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EP
European Patent Office
Prior art keywords
magnetron
vanes
anode
pair
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP07290752A
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English (en)
French (fr)
Other versions
EP1870923A3 (de
EP1870923A2 (de
Inventor
Naoya Kato
Masatoshi Higashi
Toshio Kawaguchi
Shinji Hayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Hokuto Electronics Corp
Original Assignee
Toshiba Hokuto Electronics Corp
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Publication date
Application filed by Toshiba Hokuto Electronics Corp filed Critical Toshiba Hokuto Electronics Corp
Publication of EP1870923A2 publication Critical patent/EP1870923A2/de
Publication of EP1870923A3 publication Critical patent/EP1870923A3/de
Application granted granted Critical
Publication of EP1870923B1 publication Critical patent/EP1870923B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
    • H01J25/52—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode
    • H01J25/58—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode having a number of resonators; having a composite resonator, e.g. a helix
    • H01J25/587—Multi-cavity magnetrons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/10—Magnet systems for directing or deflecting the discharge along a desired path, e.g. a spiral path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/12—Vessels; Containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/18—Resonators
    • H01J23/20—Cavity resonators; Adjustment or tuning thereof

Definitions

  • the present invention relates to a magnetron used for a microwave heating apparatus.
  • the magnetron is an electron tube generating microwaves, which is used in a microwave heating apparatus such as a microwave oven.
  • the oscillating body portion of the magnetron is provided with an anode part comprising an anode cylinder and a plurality of vanes radially arranged toward the tube axis from the inner wall of the anode cylinder, and a cathode part having a coil filament arranged along the tube axis of the anode cylinder.
  • the both ends, that is an output part side and an input part side, of the anode cylinder are provided with a pair of funnel-shaped pole pieces with a plane bottom portion where a through-hole is formed at the center thereof face-to-face together.
  • Annular permanent magnets are prepared on the pair of pole pieces respectively (e.g. Refer to Patent Document 1).
  • the structure is to supply the cathode part with electric power through the input part and to pull out a microwave generated in the oscillating body portion through the output part upon transmitting via an antenna lead.
  • the number of vanes being 10
  • the diameter 2ra of the circle inscribing the tips of vanes on the cathode side (vane tips) being 8.8 to 9.1 mm
  • the diameter 2rc of the periphery of the filament being 3.7 to 3.9 mm
  • the height A3 of the vanes in the direction of the tube axis being 8.5 to 9.5 mm
  • the open area ratio of the vane tips ⁇ Vg/(Vg + Vt) being 0.27 to 0.32 where the distance between adjacent vane tips is designated by Vg and the thickness of the vane is designated by Vt are configured at the oscillation frequency of 2450 MHz band.
  • the mutual distance A1 between base portions of a pair of pole pieces fixed to both sides of the anode cylinder being 22.5 to 23.5 mm
  • the mutual distance A2 between bottom portions of the pair of pole pieces being 11.7 to 12.7 mm
  • the inner diameter P1 of the through-hole of the pole piece being 9.4 to 9.8 mm
  • the outer diameter P2 of the bottom portion of the pole piece being 11.0 to 18.0 mm
  • Magnetic flux density Bg obtained in the interaction space is 0.17 to 0.21 tesla when the magnetic force that the existing permanent magnet possesses is converged by the pole piece mentioned above.
  • the permanent magnet is, for example, an annular ferrite magnet having an outer diameter of 50 to 57 mm, an inner diameter of 12 to 22 mm and a thickness of 10 to 13.5 mm.
  • Oscillation output efficiency of the magnetron is calculated by the ratio of the microwave power emitted from the output part to the input power (anode voltage Va ⁇ anode current Ib) applied between the anode part and the cathode part.
  • the oscillation output efficiency becomes 70 to 75% when the anode voltage Va is 3.7 to 4.6 kV and the anode current Ib is 200 to 330 mA.
  • microwave power of 1 kW or more can be outputted if the anode voltage Va of 4.5 kV, the anode current of 300 mA and the oscillation output efficiency of 75% are set.
  • Patent Document 1 Japanese Laid-open Patent No. 2003-132809
  • EP 1 594 152 A A similar magnetron is known from EP 1 594 152 A .
  • the present invention is intended for a magnetron to improve the oscillation output efficiency thereof and prevent its whole body including the permanent magnets from being enlarged, or make the above whole body be smaller than a conventional one.
  • a magnetron according to the present invention comprises; an anode part comprising an anode cylinder and a number of vanes arranged radially from an inner wall of the anode cylinder toward a tube axis, a cathode part having a coil filament arranged along the tube axis of the anode cylinder, a pair of funnel-shaped pole pieces arranged at both ends, that is an output part side and an input part side, respectively of the anode cylinder face-to-face together and having a base portion secured to the anode cylinder and a bottom portion provided with a through-hole at a central portion thereof, and a pair of annular permanent magnets arranged outside the pair of the pole pieces respectively;
  • the magnetron has an oscillation frequency in the 2450 MHz band, the number of the vanes is 10, a diameter of a circle inscribing tip portions of the vanes on the cathode side is 8.0 to 8.8 mm, a diameter of an outer periphery of the filament is
  • FIG. 1 shows the cross sectional view of the substantial part of the main body of magnetron 100 in accordance with this embodiment.
  • FIG. 2A shows a schematic top view in which the essential portion of the anode part 20 and the cathode part 3 of the magnetron 100 is extracted, and
  • FIG. 2B shows a magnified view of the pole pieces 4a and 4b.
  • the oscillation body portion of the magnetron 100 is provided with an anode part 20 formed by an anode cylinder 1 and a plurality of vanes 2 arranged radially at an equal interval toward the tube axis k from the inner wall of the anode cylinder 1, and a cathode part 3 having a coil filament 3a arranged along the tube axis k inside the anode cylinder 1. Both ends of the filament 3a are provided with a pair of end hats 3b and 3c.
  • first strap rings 6a, 6b having a smaller diameter and a pair of second strap rings 7a, 7b located outside the first strap rings and having a diameter larger than that of the first strap ring are connected alternately to the upper side (output part side) and the lower side (input part side) of each vane 2.
  • vanes 2 which are odd order ones counted from the first vane 2 are connected together with the first strap ring 6a, and vanes 2 which are even order ones are connected together with the second strap ring 7a.
  • vanes which are odd order ones are connected together with the second strap ring 7b and vanes which are even order ones are connected together with the first strap ring 6b.
  • a pair of funnel-shaped pole pieces 4a, 4b having a base portion 41 secured at both ends, that is an output part side and an input part side respectively of the anode cylinder 1, a tapered portion 42 and a flat bottom portion 43 with a through-hole 44 at the central portion thereof are provided face-to-face together.
  • Annular permanent magnets 5a, 5b are positioned above the pole piece 4a and below the pole piece 4b respectively.
  • the pole pieces 4a, 4b and the permanent magnets 5a, 5b constitute a magnetic circuit of the magnetron 100.
  • An input part 8 which supplies filament-applying power and a magnetron operating voltage is provided below the pole piece 4b in the direction of tube axis, and an output part 10 which emits a microwave transmitted through an antenna lead 9 is provided over the pole piece 4a in the direction of tube axis.
  • the magnetron has a structure in which thermal electrons emitted from the filament 3a perform orbital motion in the interaction space so as to oscillate a microwave that is transmitted through the antenna lead 9 and emitted from the output part 10.
  • the electron efficiency ⁇ e is the motion efficiency of electron
  • the circuit efficiency ⁇ c relates to a circuit coefficient such as Joule loss or dielectric loss.
  • the electron efficiency ⁇ e is known that it is represented by the equation (1).
  • ⁇ ⁇ e 1 - 1 + ⁇ 2 ⁇ B ⁇ g / B o - 1 + ⁇
  • the anode voltage Va is represented by the equation (2) :
  • V ⁇ a 2 ⁇ ⁇ ⁇ c ⁇ r ⁇ a 2 ⁇ 1 - ⁇ 2 N ⁇ ⁇ ⁇ B ⁇ g - 4 ⁇ ⁇ ⁇ c ⁇ m e N ⁇ q e ⁇ ⁇
  • FIG. 3 shows the relationship between the interaction space magnetic flux density (the magnetic flux density in the interaction space 11) Bg (ratio to the conventional value) and the electron efficiency ⁇ e (ratio to the conventional value)
  • FIG. 4 shows the relationship between the interaction space magnetic flux density Bg (ratio to the conventional value) when the anode voltage Va is constant and the diameter 2ra of the inscribing circle to the tips of the vane 2 (vane tips) (ratio to the conventional value) on the cathode 3 side.
  • the electron efficiency ⁇ e increases as the interaction space magnetic flux density Bg increases.
  • the anode voltage Va rises high as the interaction space magnetic flux density increases according to the equation (2).
  • the shape of the pole pieces 4a, 4b was thought out so as to converge the magnetic flux effectively in the interaction space, and moreover, dimensions of the anode part 20 were optimized.
  • FIGS. 5A and 5B show the measurement result of the interaction space magnetic flux density (the magnetic flux density in the interaction space 11) Bg in the case where the same permanent magnet is used.
  • FIG. 5A shows the measurement result of the value of the interaction space magnetic flux density Bg when the value of the outer diameter P2 of the bottom portions 43 of the pole pieces 4a, 4b is changed to be 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, and 16 mm, for each of the 5 sets.
  • the set above is a combination of the mutual distance A1 between the base portions 41 of the pole pieces 4a, 4b secured to both ends of the anode cylinder 11, the mutual distance A2 between the bottom portions 43 of the pole pieces 4a, 4b, the height A3 of the vane 2 in the direction of the tube axis, and the value of the inner diameter P1 of the through-hole 44 of the pole pieces 4a, 4b as shown in FIG. 5B .
  • the interaction space magnetic flux density Bg is 0.190 to 0.205 in the case of A1, A2, A3, and P1 as denoted by the mark ⁇
  • the interaction space magnetic flux density Bg can be raised up to 0.230 to 0.245 tesla if A1 being 21.5 to 23.5 mm, A2 being 10.2 to 11.2 mm, A3 being 7.0 to 8.0 mm, P1 being in the vicinity of 8.4 mm, i.e. the range of 8.4 ⁇ 0.1 mm, and P2 being 11.0 to 16.0 mm are set up.
  • the diameter 2ra of the inscribing circle of the vane tips was set to be from 8.0 to 8.8 mm so that the anode voltage Va would not be raised even though the interaction space magnetic flux density Bg became large in this embodiment.
  • the open area ratio ⁇ Vg/ (Vg + Vt) of the vane tips was set to be from 0.25 to 0.30 where Vg was the distance between vane tips adjacent to each other and Vt was the thickness of the vane 2.
  • FIGS. 6A and 6B show the result of comparison of the oscillation output efficiency ⁇ between the magnetron 100 (the magnetron according to the present invention) of the above-mentioned structure (dimensions) and a conventional magnetron.
  • FIG. 6B shows the result of the oscillation output efficiency ⁇ (%) calculated from the anode voltage Va (kV) and the microwave output Po (W) when the anode current Ib is 300 mA.
  • FIG. 6A shows the relationship between the anode voltage Va and the oscillation output efficiency ⁇ based on FIG. 6B . It is recognized from FIGS. 6A and 6B that the magnetron according to the present invention has the oscillation output efficiency ⁇ improved by 3 to 4% compared to a conventional magnetron.
  • the inner diameter of the through-hole of the pole pieces 4a, 4b is set to be P1.
  • the inner diameter of the through-hole of the pole piece on the output part 10 side and the inner diameter of the through-hole of the pole piece on the input part 8 side are set to have the same value.
  • the inner diameter of the through-hole of the pole piece on the output part 10 side can be set to be smaller than the inner diameter of the through-hole of the pole piece on the input part 8 side.
  • the magnetic flux density in the interaction space 11 can be more raised by setting the diameter at the range of 7.5 to 8.5 mm, for example 7.5 to 8.3 mm. If the inner diameter of the through-hole of the pole piece 4a is set to be 8.0 mm, the magnetic flux density Bg can be raised by about 0.03 to 0.05 tesla.
  • FIG. 7 shows main dimensions of the oscillation body portion about the magnetron 100 relating to an embodiment of the present invention and a conventional magnetron.
  • the magnetic flux density Bg obtained in the interaction space 11 can be raised up to 0.210 to 0.245 tesla even with magnetic power of the present permanent magnets 5a, 5b by means of designing dimensions of the magnetic circuit and the anode part smaller in total than conventional one.
  • the oscillation output efficiency ⁇ can be improved by 3 to 4 % even if the anode voltage Va is from 3.7 to 4.6 kV and the anode current Ib is from 200 to 300 mA.
  • the magnetic flux density obtained in the interaction space 11 is increased even with present permanent magnets 5a, 5b, and the oscillation output efficiency can be improved even with a conventional anode voltage.
  • improving the oscillation output efficiency without enlarging the whole body including the permanent magnets in respect to a magnetron can be achieved.

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  • Microwave Tubes (AREA)

Claims (4)

  1. Ein Magnetron (100) umfassend:
    einen Anodenteil (20) umfassend einen Anodenzylinder (1) und eine Mehrzahl von Stegen (2), die radial von der inneren Wand des Anodenzylinders in Richtung der Röhrenachse (k) angeordnet sind,
    einen Kathodenteil (3), der ein Wendel (3a) aufweist, das entlang der Röhrenachse des Anodenzylinders angeordnet ist,
    ein trichterförmiges Polstückpaar (4a, 4b), das an einer Ausgangsbereichsseite beziehungsweise einer Eingangsbereichsseite des Anodenzylinders einander gegenüberliegend angeordnet ist und einen an dem Anodenzylinder befestigten Basisabschnitt (41) aufweist und einen unteren Abschnitt (43), ausgestattet mit einem Durchgangsloch (44) im mittleren Bereich, und
    ein Paar ringförmiger Permanentmagneten (5a, 5b), jeder außerhalb des entsprechenden Polstücks des Polstückpaars angeordnet;
    dadurch gekennzeichnet, dass das Magnetron eine Schwingfrequenz im 2450 MHz Band aufweist, die Anzahl der Stege 10 ist, ein Durchmesser (2ra) eines Kreises, über die Kopfteile der Stege auf Seite der Kathode beschrieben, 8,0 bis 8,8 mm beträgt, ein Durchmesser (2rc) eines äußeren Umfangs des Wendels 3,5 bis 3,9 mm beträgt, eine Höhe (A3) der Stege in Richtung der Röhrenachse 7,0 bis 8,0 mm beträgt, ein gegenseitiger Abstand (A1) zwischen dem Basisabschnitt des Polstückpaars 21,5 bis 23,5 mm beträgt, ein gegenseitiger Abstand (A2) zwischen den unteren Abschnitten des Polstückpaars 10,2 bis 11,2 mm ist, ein innerer Durchmesser (P1) des Durchgangslochs eines jeden Polstücks 8,3 bis 8,5 mm beträgt und ein äußerer Durchmesser (P2) des unteren Abschnitts 11,0 bis 16,0 mm beträgt.
  2. Das Magnetron gemäß Anspruch 1, wobei ein offenes Flächenverhältnis Vg/(Vg + Vt) am Kopf des Steges auf 0,25 bis 0,30 festgelegt ist, wobei der Abstand zwischen benachbarten Kopfteilen der Stege auf der Kathodenseite mit Vg bezeichnet wird und die Dicke des Steges mit Vt.
  3. Das Magnetron gemäß einem der Ansprüche 1 bis 2, wobei der innere Durchmesser des Durchgangslochs des Polstücks auf der Ausgangsbereichsseite kleiner ist als der innere Durchmesser des Durchgangslochs des Polstücks auf der Eingangsbereichsseite.
  4. Das Magnetron gemäß Anspruch 3, wobei der innere Durchmesser des Durchgangslochs des Polstücks auf der Ausgangsbereichsseite 7,5 bis 8,3 mm beträgt.
EP07290752A 2006-06-19 2007-06-18 Magnetron Active EP1870923B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006168505A JP4898316B2 (ja) 2006-06-19 2006-06-19 マグネトロン

Publications (3)

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EP1870923A2 EP1870923A2 (de) 2007-12-26
EP1870923A3 EP1870923A3 (de) 2008-01-23
EP1870923B1 true EP1870923B1 (de) 2010-12-01

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EP07290752A Active EP1870923B1 (de) 2006-06-19 2007-06-18 Magnetron

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US (1) US20070296515A1 (de)
EP (1) EP1870923B1 (de)
JP (1) JP4898316B2 (de)
KR (1) KR100866233B1 (de)
CN (1) CN100550263C (de)
DE (1) DE602007010865D1 (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4503639B2 (ja) 2007-09-11 2010-07-14 東芝ホクト電子株式会社 電子レンジ用マグネトロン
JP5415119B2 (ja) 2009-03-30 2014-02-12 東芝ホクト電子株式会社 電子レンジ用マグネトロン
CN101847556A (zh) * 2010-05-19 2010-09-29 美的集团有限公司 一种磁控管
WO2014010226A1 (ja) * 2012-07-09 2014-01-16 東芝ホクト電子株式会社 プラズマ発光装置とそれに用いる電磁波発生器
JP6261897B2 (ja) * 2013-07-05 2018-01-17 東芝ホクト電子株式会社 プラズマ発光装置とそれに用いる電磁波発生器
JP6261898B2 (ja) * 2013-07-05 2018-01-17 東芝ホクト電子株式会社 プラズマ発光装置とそれに用いる電磁波発生器
JP6261899B2 (ja) * 2013-07-05 2018-01-17 東芝ホクト電子株式会社 プラズマ発光装置とそれに用いる電磁波発生器
JP6254793B2 (ja) * 2013-08-29 2017-12-27 東芝ホクト電子株式会社 マグネトロン
KR102149316B1 (ko) * 2013-12-18 2020-10-15 삼성전자주식회사 마그네트론 및 그를 가지는 고주파 가열기기
KR101531222B1 (ko) * 2014-09-03 2015-06-24 신준식 마그네트론
JP5805842B1 (ja) 2014-12-03 2015-11-10 東芝ホクト電子株式会社 マグネトロン
CN108751986B (zh) * 2018-06-29 2021-02-02 安徽省徽腾智能交通科技有限公司 一种利用电磁波烧结氧化锆-氧化钇陶瓷的装置
US11255016B2 (en) 2019-10-04 2022-02-22 Mks Instruments, Inc. Microwave magnetron with constant anodic impedance and systems using the same

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JPS63110527A (ja) * 1986-10-27 1988-05-16 Toshiba Corp 電子レンジ用マグネトロン
EP0263491B1 (de) * 1986-10-06 1993-08-25 Kabushiki Kaisha Toshiba Magnetron für einen Mikrowellenherd
JPH06223729A (ja) * 1993-01-25 1994-08-12 Matsushita Electron Corp マグネトロン
US5635798A (en) * 1993-12-24 1997-06-03 Hitachi, Ltd. Magnetron with reduced dark current
US5635797A (en) * 1994-03-09 1997-06-03 Hitachi, Ltd. Magnetron with improved mode separation
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JP4670027B2 (ja) * 2000-10-18 2011-04-13 日立協和エンジニアリング株式会社 マグネトロン
JP2002343262A (ja) * 2001-05-17 2002-11-29 Sanyo Electric Co Ltd マグネトロン
EP1286379B1 (de) * 2001-08-22 2012-05-09 Panasonic Corporation Magnetron
JP3925153B2 (ja) * 2001-10-24 2007-06-06 松下電器産業株式会社 マグネトロン
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KR100493298B1 (ko) * 2002-11-20 2005-06-07 엘지전자 주식회사 마그네트론 및 마그네트론 부재 간 접합 방법
KR100519340B1 (ko) * 2003-01-16 2005-10-07 엘지전자 주식회사 마그네트론용 소형 아노드
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KR100651905B1 (ko) * 2005-03-29 2006-12-01 엘지전자 주식회사 마그네트론

Also Published As

Publication number Publication date
KR100866233B1 (ko) 2008-10-30
DE602007010865D1 (de) 2011-01-13
US20070296515A1 (en) 2007-12-27
CN100550263C (zh) 2009-10-14
EP1870923A3 (de) 2008-01-23
CN101093770A (zh) 2007-12-26
JP2007335351A (ja) 2007-12-27
JP4898316B2 (ja) 2012-03-14
KR20070120460A (ko) 2007-12-24
EP1870923A2 (de) 2007-12-26

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